LM3S328 Luminary Micro, Inc., LM3S328 Datasheet - Page 305
LM3S328
Manufacturer Part Number
LM3S328
Description
Microcontroller
Manufacturer
Luminary Micro, Inc.
Datasheet
1.LM3S328.pdf
(359 pages)
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Figure 14-13. Slave Command Sequence
14.2.2
October 8, 2006
Available Speed Modes
The SCL clock rate is determined by the parameters: CLK_PRD, TIMER_PRD, SCL_LP, and
SCL_HP.
where:
CLK_PRD
SCL_LP
SCL_HP
TIMER_PRD
page 315).
The SCL clock period is calculated as follows:
SCL_PERIOD = 2*(1 + TIMER_PRD)*(SCL_LP + SCL_HP)*CLK_PRD
For example:
CLK_PRD = 50 ns
TIMER_PRD = 2
SCL_LP=6
SCL_HP=4
yields a SCL frequency of:
1/T = 333 Khz
is the Low phase of the SCL clock (fixed at 6)
is the High phase of the SCL clock (fixed at 4)
is the system clock period
is the programmed value in the I2C Master Timer Period (I2CMTPR) register (see
address to I2CSOAR
write OWN Slave
write “-------1”
to I2CSCSR
N
N
read I2CSCSR
Idle
write Data to
RREQ=”1”
TREQ=”1”
I2CSDR
Preliminary
Y
Y
read Data from
I2CSDR
LM3S328 Data Sheet
305
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